Add a custom footer menu in a WordPress Theme

Put this code in your functions.php

register_nav_menus(
  array('footer' => __( 'footer-menu', 'THEME_NAME' ),)
);

Then go into WordPress and add a new menu. Call it “footer”.

Then on the left side, you’ll now see a drop-down menu to set a footer menu. Select the “footer” menu you just created.

Finally, go to your footer.php file and call the menu using the following code:

<?php wp_nav_menu( array( 'theme_location' => 'footer' ) ); ?>